TCS Company Numerical Ability Permutation and Combination

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TCS Other Question

Find no of ways in which 4 particular persons a,b,c,d and 6 more persons can stand in a queue so that A always stand before B. B always stand before C, And C always stand before D. A mother has 3 babies Usha, Nisha and Eesha.
If Usha is sleeping, Eesha is drinking milk.
If Nisha is not sleeping, Eesha is not drinking.
It never happens that both Usha and Nisha are sleeping.
Father concludes that Usha never sleeps.
Mother concludes that Nisha never sleeps.
Nurse concludes that Eesha always drinks.
Who has made a correct deduction?